Sakhabutdinov, A. G.; Usmanova, A. G.; Frolov, P. A.; Zinchenko, S. V.; Shmidt, F. K. Journal of Organic Chemistry USSR (English Translation), 1992 , vol. 28, # 7.1 p. 1043 - 1047 Zhurnal Organicheskoi Khimii, 1992 , vol. 28, # 7 p. 1329 - 1333